Legacy System Modernization Companies

Automated .NET Framework to .NET 8 project file and code migration

AngularJS to React migration guidance and component scaffolding

Conditional Access policy JSON and PowerShell migration script generation

Automated C# and .NET code refactoring recipes

Automated VB6 to VB.NET or C# code conversion

Warsaw-based AI-focused software house founded in 2009 with 49 engineers delivering full-stack solutions to fintech, blockchain, and enterprise clients. 95 projects completed across 18 countries; ~90% of client reviews highlight on-time delivery, strong project management, and technical depth.

Accenture is a global professional services powerhouse with deep expertise in mainframe modernization. They combine strategic consulting with massive execution scale, leveraging partnerships with all major cloud providers. Their "myNav" platform helps chart the best migration path.

CAST provides automated code analysis and application intelligence. Their flagship product, CAST Highlight, rapidly scans entire application portfolios (100+ apps) to assess technical debt, cloud readiness, and security vulnerabilities - ideal for large-scale legacy assessments and M&A due diligence.

Founded in 2012 with 49 engineers in New York City, Cleverroad delivers software for SaaS and FinTech companies. The firm handles product strategy through discovery and roadmap planning, then executes over multi-month sprints with transparent stakeholder reporting.

Cognizant is ranked #1 in Application Modernization by HFS. Their "Skygrade" platform acts as a force-multiplier, utilizing generative AI and modern tooling to accelerate holistic cloud-native transformations, particularly in banking and healthcare.

Embarcadero provides the tools and frameworks for Delphi and C++Builder development. They offer modernization strategies and tools to help organizations migrate legacy Delphi applications to modern platforms or update them to the latest Delphi versions.

EPAM is known for its high-end software engineering capabilities. They don't just "migrate" code; they re-engineer it into modern, scalable digital products. Their "SAMP" platform accelerates modernization while maintaining high code quality standards.

Feathersoft provides specialized legacy migration services, with a strong focus on Visual Basic 6 (VB6) to .NET transformations. They offer cost-effective migration factories and dedicated teams to handle the tedious work of upgrading legacy desktop applications.

Now part of OpenText, Micro Focus provides the tooling that powers many other vendors' migrations. Their "Visual COBOL" allows running COBOL on .NET/JVM, and "Enterprise Analyzer" is the gold standard for legacy code assessment.

Mobilize.Net is the undisputed leader in Windows-legacy modernization. Their tools (VBUC, WebMAP) are the industry standard for migrating Visual Basic 6 (VB6), PowerBuilder, and Silverlight applications to modern .NET, Angular, and Azure Web Apps.

Modernizing Medicine specializes in healthcare legacy system assessment and modernization. They understand HIPAA compliance requirements and healthcare-specific legacy platforms (e.g., legacy EHR systems, patient management systems) - critical for healthcare organizations modernizing clinical applications.

N-iX is a leading Eastern European software engineering firm. They offer high-quality engineering talent for modernization projects, often at a more competitive price point than the major US/UK consultancies. Strong in Cloud and DevOps.

SoftServe combines deep engineering expertise with strong industry verticals, particularly in Healthcare and Retail. Their Application Modernization Platform (SAMP) provides a repeatable framework for moving to AWS and Azure.

SIG provides independent software quality assessments based on ISO 25010 standards. They benchmark code quality against industry standards and are frequently used for M&A technical due diligence - providing objective, defensible quality ratings for software portfolios.

Thoughtworks pioneered many of the patterns used in modern software development, including the "Strangler Fig" pattern for legacy modernization. They are the premium choice for complex, strategic re-architecting where code quality and domain alignment are paramount.

The Software Revolution, Inc. (TSRI) specializes in automated modernization for mission-critical systems, particularly in defense and government. Their JANUS Studio® achieves near 100% automation for rare languages like Ada, Fortran, and Jovial, as well as standard COBOL.

vFunction specializes in analyzing Java monoliths for microservices migration. Their platform uses runtime analysis and static code analysis to automatically identify domain boundaries and recommend decomposition strategies - purpose-built for Java modernization assessments.